JP3059784B2 - Optical playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical reproducing apparatus for reading and reproducing information optically (hereinafter referred to as a reproducing apparatus), and more particularly to a connection with an external control apparatus (host computer) for controlling the apparatus. Things.

[0002]

2. Description of the Related Art In order to reproduce information recorded on a CD-ROM (read only memory using a compact disk) disk (hereinafter, referred to as a disk), a reproducing apparatus having a pickup for optically reading information, A host computer for controlling the playback device, a CRT display device (hereinafter, referred to as CRT) for displaying information read from a disc, and a keyboard device for inputting data and commands to the host computer are required. Connected in a way

Conventionally, when a playback device is connected to a host computer, a dedicated I / F (interface) board is attached to an expansion slot of the host computer, and the playback device and the host are connected only by so-called parallel communication using the dedicated I / F board. Data communication with the computer was performed.

[0004]

However, a computer having no expansion slot (for example, a laptop personal computer, a notebook personal computer, etc.) cannot be equipped with a dedicated I / F board. There was a problem that it could not be directly connected to the device.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and enables any computer to be connected to a reproducing apparatus regardless of the type of computer. It is an object of the present invention to provide an optical reproducing apparatus capable of performing data communication with a reproducing apparatus without a dedicated I / F board required for a host computer.

[0006]

The optical reproducing apparatus of the present invention is connected to external control means for controlling an optical reproducing apparatus for reading and reproducing information optically, and the optical reproducing apparatus and the external reproducing apparatus are connected to each other. First and second communication means for performing data communication with the control means, input / output processing means for temporarily storing and inputting and outputting input / output data, and one of the first and second communication means In an optical reproducing apparatus comprising a selection connection means for selectively connecting one of them, and a switching means for switching to one of the first and second communication means, the first communication means comprises the external control means Connection circuit with the dedicated interface board of
The communication means is a connection circuit for connecting to a printer port provided in the external control means, and includes a latch means for latching 1-byte data, and a selection means for selecting data latched by the latch means on a 2-bit basis. Communication means comprising: means, counting means for counting pulses of a read signal output from the external control means, and reset means for resetting the counting means when the counting means performs a predetermined count. This problem has been solved by an optical reproducing apparatus characterized by the following.

[0007]

[0008]

[0009]

[0010]

According to the present invention, a connection circuit (parallel communication circuit) for connecting a reproduction apparatus to a dedicated I / F board of an external control means and a connection circuit (serial communication circuit) for connecting to a printer port provided in the external control means are provided. Is set in advance to either the parallel communication or the serial communication by the switching means. The setting state is detected by the selection connection means, and the communication circuit which has been set is selected. Data communication is performed between and.

[0011]

1 to 4 show one embodiment of the present invention. FIG. 1 is a block diagram showing a first embodiment of the present invention, and FIG. 2 is a block diagram showing a serial communication circuit according to the present invention. FIG. 3 is a timing chart when 1-byte data is divided into four and output, and FIG. 4 is a block diagram showing a second embodiment of the present invention.

In FIG. 1, (1) is a reproducing apparatus main body,
(2) is a CPU (Central Processing Unit) which controls the whole apparatus, and (3) is a disk which is driven to rotate by a drive motor (not shown). (4) is a CD-DA decoding circuit for decoding a data string read from the disk (3) by a pickup (not shown) into serial data in a CD-DA (Digital Audio) format, and (5) is a C-DA decoding circuit.
The signal output from the D-DA decoding circuit (4) is converted to a CD-R
CD-ROM decoding circuit and host I / F circuit for decoding to OM data signal, (6) parallel communication circuit, (7)
Is a serial communication circuit, and (8) is a P / S (parallel / serial) communication selection circuit that switches either the parallel communication circuit (6) or the serial communication circuit (7) depending on the operation state of a switch (10) described later. select. (9) an I / O (input / output) buffer circuit for temporarily storing and inputting and outputting input / output data, (10) a switch for switching to a desired communication circuit of parallel communication or serial communication,
(11) is a servo and drive circuit for a disk (3)
A servo system for focus adjustment and track following of the pickup for reading the above information and a drive system for reciprocating the pickup in the radial direction of the disk (3) are controlled.
Reference numeral (12) denotes a host computer having a printer port (13) for controlling the playback device (1) and connected to the playback device (1) by an I / F cable (14).
Reference numeral (15) denotes a CRT which displays a display accompanying execution of processing under the control of the host computer (12). (16) is a keyboard device for inputting data and commands to the host computer (12).

In the optical reproducing apparatus constructed as described above, when reproducing information on the disk (3), data and commands necessary for reproducing the information are transmitted by the keyboard device (16) to the host computer (12). )
To the playback device (1) and the host computer (1).
2) is executed by a desired communication method (parallel communication or serial communication). A data string read by the pickup from the disk (3) is input to a CD-DA decoding circuit (4) and is decoded into serial data of a predetermined CD-DA format. The decrypted data is CD
-Input to the ROM decoding circuit and the host I / F circuit (5), and are decoded as CD-ROM data signals. Then, the P / S communication selection circuit (8) detects the operation state of the switch (10) and outputs the output data from the CD-ROM decoding circuit and the host I / F circuit (5) to the parallel communication circuit (6) or Input to the serial communication circuit (7). When the parallel communication program is installed in the host computer (12), the switch (10) is switched to the parallel communication side. The P / S communication selection circuit (8) inputs data to the parallel communication circuit (6), and communication is performed under the control of a parallel communication program of the host computer (12). When the serial communication program is installed in the host computer (12), the switch (1)
0) is switched to the serial communication side. The P / S communication selection circuit (8) inputs data to the serial communication circuit (7),
Communication is performed by a serial communication program of the host computer (12).

Thus, the data output from the CD-ROM decoding circuit and the host I / F circuit (5) pass through the I / O buffer circuit (9) and the I / F cable (14) in the designated communication circuit. To the host computer (12) to display desired information on the CRT (15).

Here, the serial communication circuit (7) used in the reproducing apparatus (1) of the present invention will be described. FIG. 2 is a configuration diagram of the serial communication circuit (7).

In FIG. 2, WR (Wright), DAT
A, STEN (Status Enable), DTEN (Data
Enable), C / D (Command / Data), RD
(Read), DH (Data High) and DL (Data
Lower) are signal lines, respectively, and are effective in the direction of the arrow. The WR signal causes a command from the host computer (12) to be stored in the memory of the CD-ROM decoding circuit and the host I / F circuit (5). DATA is a data bus dedicated to commands. The STEN signal and the DTEN signal are signals indicating that the playback device (1) can output status or data to the host computer (12), respectively. That is, when a standby state for sending the status to the host computer (12) is established, STEN is set.
The signal goes low, and the DTEN signal goes low when in a standby state for sending data. DH is 8
The output of the upper bit data of the data latched by the bit latch circuit (17), and DL is the output of the lower bit data of the data latched by the 8-bit latch circuit (17). (17) is a transparent-type 8-bit latch circuit for latching data output from the CD-ROM decoding circuit and the host I / F circuit (5) into 8 bits, and (18) is a channel 1 (18a), a channel. 2
(18b) and a channel control unit (18c). The selector latches the data latched in the 8-bit latch circuit (17) by 4 bits in channel 1 (18a).
The 4-bit data is selected on channel 2 (18b). (19) is a read pulse counter for counting the pulses of the RD signal output from the host computer (12), and is constituted by a 2-bit binary counter.
(20) The clear signal generation circuit detects the rising or rising edge of the C / D switching signal and resets the read pulse counter (19).

Now, serial communication by the serial communication circuit (7) configured as described above will be described with reference to FIG.

First, the clear signal generation circuit (20) detects the rising or falling edge of the C / D switching signal, and resets the read pulse counter (19) to "0". When the read pulse counter (19) is reset, the RD signal is input from the host computer (12) to the read pulse counter (19), and the CD-ROM decoding circuit and the host I / F are synchronized with the pulse of this signal.
When one byte of data is latched from the circuit (5) into the 8-bit register circuit (17),
(18a) and channel 2 (18b) are controlled by the channel controller (18c), and select BIT7 and BIT6 from the latched data and output them to DH and DL, respectively. At this time, the read pulse counter (1
9) counts “1”. Host computer (1
From 2), the next RD signal is read pulse counter (19)
, The channel 1 (18a) and the channel 2 (18b) are controlled by the channel control unit (8c), and BIT5 and BI
T4 is selected and output to DH and DL, respectively. Then, the read pulse counter (19) detects the falling edge of the pulse of the RD signal and counts as "2".
In this way, every time the RD signal is input to the read pulse counter (19), the read pulse counter (19) detects the falling edge of the pulse and counts "1", and the selector (18) sets the 8-bit latch. Circuit (17)
As shown in Table 1, the data latched into the data is divided into four by 2 bits and output to DH and DL, respectively, to process 1-bit 8-bit data. The read pulse counter (19) is reset to "0" by the input of the fourth RD signal.

[0019]

[Table 1]

Whether to execute by parallel communication or serial communication is determined by the operator based on the presence or absence of an I / F board of the host computer (11) or the data bus input / output mode of the printer port (11). The changeover switch (10) is operated in advance.

For example, if the host computer (12) has no I / F board without an expansion slot, the I / F cable (14) is connected to the printer port (13) of the host computer (12). The serial communication or the parallel communication is set by the changeover switch (10) according to the following conditions.

Serial communication when the data bus of the printer port (13) of the host computer (11) is dedicated to output.

Even if the data bus of the printer port (13) of the host computer (11) can output bidirectionally and the output direction can be controlled by the control program, the control program can operate the printer port (12) for each bit. When is serial communication.

When the data bus of the printer port (12) of the host computer (11) can output bidirectionally and the output direction can be controlled by a control program, parallel communication is performed.

On the other hand, the I / O
When the F board is attached, parallel communication is performed with the playback device (1) as in the related art.

FIG. 4 shows a second embodiment of the present invention. In the second embodiment, a P / S switching detection circuit (21) is provided as shown in FIG.
The parallel communication or the serial communication may be automatically selected by detecting the mode identification signal output from.

[0027]

According to the present invention, the second communication means according to the first aspect of the present invention is a circuit for connecting to a printer port provided in the external control means, and latches one byte of data. Latch means, selecting means for selecting data latched by the latch means by two bits, counting means for counting pulses of a read signal output from the external control means, and when the counting means performs a predetermined count. And a reset means for resetting the counting means.
Even in a computer on which a board cannot be mounted, even if the data bus of the printer port of the computer is dedicated to output, the computer can be connected to a reproducing device using the printer port, and the dedicated I / F Data communication with a playback device can be performed without a board, and a dedicated I / F
The board can be omitted, which is effective for cost reduction.

[Brief description of the drawings]

FIG. 1 is a block diagram according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a serial communication circuit.

FIG. 3 is a timing chart when 1-byte data is divided into four and output.

FIG. 4 is a block diagram according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reproduction apparatus main body 2 CPU 3 CD-ROM disk 4 CD-DA decoding circuit 5 CD-ROM decoding circuit and host I / F circuit 6 Parallel communication circuit 7 Serial communication circuit 8 P / S communication selection circuit 9 I / O buffer circuit 10 Switch 11 Servo and drive circuit 12 Host computer 13 Printer port 14 I / F cable 15 CRT 16 Keyboard device 17 8-bit latch circuit 18 Selector 18a Channel 1 18b Channel 2 18c Channel control unit 19 Read pulse counter 20 Clear signal generation circuit 21P / S switch detection circuit

Claims (1)

(57) [Claims] An external control means for controlling an optical reproducing apparatus for optically reading and reproducing information is connected , and first and second means for performing data communication between the optical reproducing apparatus and the external control means. Second communication means; input / output processing means for temporarily storing input / output data and inputting / outputting the input / output data;
An optical communication device comprising: a selection connection means for selectively connecting one of the communication means and the second communication means; and a switching means for switching to one of the first and second communication means.
In raw device, the first communication means is a connection circuit between the dedicated interface board of the external control means, said second communication means connected circuit of a printer port, which is provided to said external control means a is a latch means for latching a byte of data, and selection means for the latched data to select two bits to the latch means,
Communication means comprising: counting means for counting pulses of a read signal output from the external control means; and reset means for resetting the counting means when the counting means performs a predetermined count. Optical playback device.